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Message-ID: <20251009075149.1083040-1-safinaskar@gmail.com>
Date: Thu, 9 Oct 2025 10:51:49 +0300
From: Askar Safin <safinaskar@...il.com>
To: linux-kbuild@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>,
regressions@...ts.linux.dev
Cc: nathan@...nel.org,
linux-kernel@...r.kernel.org,
miguel.ojeda.sandonis@...il.com,
nsc@...nel.org,
ojeda@...nel.org,
sam@...too.org,
thomas.weissschuh@...utronix.de,
Daniel Xu <dxu@...uu.xyz>
Subject: [REGRESSION][BISECTED] kbuild: CFLAGS=-w no longer works
#regzbot introduced: d1d0963121769d8d16150b913fe886e48efefa51
As well as I understand, if you want to disable warnings, you
should pass "CFLAGS=-w" to "make". Starting with d1d096312176,
this no longer works.
Steps to reproduce:
$ cd linux
$ git clean -f -q -d -x # To clean everything not controlled by git
$ echo 'CONFIG_64BIT=y' > /tmp/minimini
$ make allnoconfig KCONFIG_ALLCONFIG=/tmp/minimini
$ make -j32 CFLAGS=-w
My system info:
d-user@...p:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 14.2.0-19' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr --with-gcc-major-version-only --program-suffix=-14 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/reproducible-path/gcc-14-14.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/reproducible-path/gcc-14-14.2.0/debian/tmp-gcn/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=3
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Debian 14.2.0-19)
d-user@...p:~$ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 13 (trixie)"
NAME="Debian GNU/Linux"
VERSION_ID="13"
VERSION="13 (trixie)"
VERSION_CODENAME=trixie
DEBIAN_VERSION_FULL=13.1
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
Culpit commit (d1d096312176) produces this output:
d-user@...p:/rbt$ cd linux
d-user@...p:/rbt/linux$ git clean -f -q -d -x
d-user@...p:/rbt/linux$ echo 'CONFIG_64BIT=y' > /tmp/minimini
d-user@...p:/rbt/linux$ make allnoconfig KCONFIG_ALLCONFIG=/tmp/minimini
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/confdata.o
HOSTCC scripts/kconfig/expr.o
LEX scripts/kconfig/lexer.lex.c
YACC scripts/kconfig/parser.tab.[ch]
HOSTCC scripts/kconfig/lexer.lex.o
HOSTCC scripts/kconfig/menu.o
HOSTCC scripts/kconfig/parser.tab.o
HOSTCC scripts/kconfig/preprocess.o
HOSTCC scripts/kconfig/symbol.o
HOSTCC scripts/kconfig/util.o
HOSTLD scripts/kconfig/conf
#
# configuration written to .config
#
d-user@...p:/rbt/linux$ make -j32 CFLAGS=-w
GEN arch/x86/include/generated/asm/orc_hash.h
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/errno.h
WRAP arch/x86/include/generated/uapi/asm/fcntl.h
UPD include/generated/uapi/linux/version.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
WRAP arch/x86/include/generated/uapi/asm/ioctl.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
WRAP arch/x86/include/generated/uapi/asm/ioctls.h
WRAP arch/x86/include/generated/uapi/asm/ipcbuf.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
WRAP arch/x86/include/generated/uapi/asm/param.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/uapi/asm/resource.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
WRAP arch/x86/include/generated/uapi/asm/socket.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
WRAP arch/x86/include/generated/uapi/asm/sockios.h
WRAP arch/x86/include/generated/uapi/asm/termbits.h
WRAP arch/x86/include/generated/uapi/asm/termios.h
WRAP arch/x86/include/generated/uapi/asm/types.h
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
UPD include/generated/compile.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/fprobe.h
HOSTCC scripts/kallsyms
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mmzone.h
HOSTCC scripts/sorttable
WRAP arch/x86/include/generated/asm/irq_regs.h
WRAP arch/x86/include/generated/asm/kmap_size.h
WRAP arch/x86/include/generated/asm/local64.h
WRAP arch/x86/include/generated/asm/mmiowb.h
WRAP arch/x86/include/generated/asm/module.lds.h
UPD include/config/kernel.release
WRAP arch/x86/include/generated/asm/rwonce.h
DESCEND objtool
UPD include/generated/utsrelease.h
INSTALL /rbt/linux/tools/objtool/libsubcmd/include/subcmd/exec-cmd.h
INSTALL /rbt/linux/tools/objtool/libsubcmd/include/subcmd/help.h
INSTALL /rbt/linux/tools/objtool/libsubcmd/include/subcmd/pager.h
INSTALL /rbt/linux/tools/objtool/libsubcmd/include/subcmd/parse-options.h
INSTALL /rbt/linux/tools/objtool/libsubcmd/include/subcmd/run-command.h
INSTALL libsubcmd_headers
HOSTLD arch/x86/tools/relocs
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
CC scripts/mod/devicetable-offsets.s
CC /rbt/linux/tools/objtool/libsubcmd/exec-cmd.o
CC /rbt/linux/tools/objtool/libsubcmd/help.o
CC /rbt/linux/tools/objtool/libsubcmd/pager.o
CC /rbt/linux/tools/objtool/libsubcmd/parse-options.o
CC /rbt/linux/tools/objtool/libsubcmd/run-command.o
CC /rbt/linux/tools/objtool/libsubcmd/sigchain.o
CC /rbt/linux/tools/objtool/libsubcmd/subcmd-config.o
exec-cmd.c:2:10: fatal error: linux/compiler.h: No such file or directory
2 | #include <linux/compiler.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [/rbt/linux/tools/build/Makefile.build:86: /rbt/linux/tools/objtool/libsubcmd/exec-cmd.o] Error 1
make[5]: *** Waiting for unfinished jobs....
parse-options.c:2:10: fatal error: linux/compiler.h: No such file or directory
2 | #include <linux/compiler.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [/rbt/linux/tools/build/Makefile.build:86: /rbt/linux/tools/objtool/libsubcmd/parse-options.o] Error 1
In file included from sigchain.c:3:
subcmd-util.h:8:10: fatal error: linux/compiler.h: No such file or directory
8 | #include <linux/compiler.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [/rbt/linux/tools/build/Makefile.build:86: /rbt/linux/tools/objtool/libsubcmd/sigchain.o] Error 1
MKELF scripts/mod/elfconfig.h
In file included from help.c:12:
subcmd-util.h:8:10: fatal error: linux/compiler.h: No such file or directory
8 | #include <linux/compiler.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
HOSTCC scripts/mod/modpost.o
make[5]: *** [/rbt/linux/tools/build/Makefile.build:85: /rbt/linux/tools/objtool/libsubcmd/help.o] Error 1
HOSTCC scripts/mod/sumversion.o
In file included from run-command.c:11:
subcmd-util.h:8:10: fatal error: linux/compiler.h: No such file or directory
8 | #include <linux/compiler.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
HOSTCC scripts/mod/symsearch.o
make[5]: *** [/rbt/linux/tools/build/Makefile.build:85: /rbt/linux/tools/objtool/libsubcmd/run-command.o] Error 1
UPD scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
make[4]: *** [Makefile:78: /rbt/linux/tools/objtool/libsubcmd/libsubcmd-in.o] Error 2
make[3]: *** [Makefile:83: /rbt/linux/tools/objtool/libsubcmd/libsubcmd.a] Error 2
make[2]: *** [Makefile:73: objtool] Error 2
make[1]: *** [/rbt/linux/Makefile:1430: tools/objtool] Error 2
make[1]: *** Waiting for unfinished jobs....
HOSTLD scripts/mod/modpost
CC kernel/bounds.s
CHKSHA1 include/linux/atomic/atomic-arch-fallback.h
CHKSHA1 include/linux/atomic/atomic-instrumented.h
CHKSHA1 include/linux/atomic/atomic-long.h
UPD include/generated/timeconst.h
UPD include/generated/bounds.h
CC arch/x86/kernel/asm-offsets.s
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
make: *** [Makefile:251: __sub-make] Error 2
--
Askar Safin
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